Latch mechanism



J1 1927' c. F. BOUCEK LATCH MECHANIS M Filed Feb. 18, 192.6- 7 2 Sheets-Sheet 1 WWI W, 35, a I W5.

June 28 1927. 1,634,013

0. F. BOUCEK LATCH MECHANISM Filed Feb. 18, 1926 2 Sheets-Sheet 2 Patented June 28 1927.

UNITED. STATES PATENT OFFICE.

CHARLES F. BOUCEK, OF CHICAGO, ILLINOIS, ASSIGNOR TO RUDA MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.- i

' LA'IGH MECHANISM.

Application filed February The object of the invention is to provide simple, practical, and efficient latch mecha-.

nism which will automatically lock the sash in vertical position when swung to such position, and which can be readily mampulated to release the sashv for swinging movement. My improved mechanism will assure secure locking of the sash when swung into vertical position so that the sash cannot. be accidentally swung open by wind pressure or fromlother causes.

On the drawing Figure 1 is a front elevational view of a window frame and the upper and lower sash therein;

Fig. 2 is a sectional view on line 22 of Fig. 1;

Fig. 3 is an enlarged sectional view on plane 3-3 of Fig. 2 showing the lower sash in locked vertical position;

Fig. 1 is .a view similar to Fig.3 but showing the latch mechanism released to permit the sash to be swunggopen;

Fig. 5 is a front elevational view of the parts shown in Fig. .3;

Fig. 6 is a plan View of the sash latch part; and

Fig. 7 .is a rear view of the sash latch art. I

On the structure shown the window frame F which receives the upper and lower sashes S and S is constructed of sheet metal and in its side has the inner and outer runner channels 10 and 11 for the lower and upper sashes, respectively. These channels are lined by weather strip frames 12 and 13 of sheet metal and within these weather strip frames are the runner structures 14 and 15 to which the lower and upper sashes, respectively, are attached. The sash stiles are of sheet metal and cO-Operatewith the weather strip frames to provide weather tight joints,

Each sash has at each of its lower corners a pivot pin 16 which is held and journalled in the lower end of the respective runner frame, these runner frames being shown as of channel shape and constructed of sheet s, 1925. Serial No. 88,995.

metal, Above each pivot connection .a sup porting bar 17 is pivoted at its outer end to the respective side of the sash and at its" inner end is pivoted to a pin 18 which extends through a slot 19 to the runner 9 and. is secured to a cam plate 20. Within the runner frame above the cam plate therein a brake plate 21 is pivoted by a pin 22 and has a brake shoe'23 adapted to extend through the opening 24 inv the adjacent side wall of the runner frame to engage against the side of the runner channel with frictional engagement. On the inner side of the pin a link 25 is pivoted to the brake: plate and from this link a cord .26 extends over a pulley 27 and to asash weight in the well known manner, the sash weight :act ing on the cord 26 tending to swing the I brake plate to engage its brake shoe with the runner channel side to thus lock the sash against vertical movement when the sash is swung open and the cam plates have been released from the brake plates, the cam plates having the wedging surfaces 28 which engage with the wedging surfaces 29. on the brake plates to swing the brake plates to restore their brake shoes from breaking engagement with the runner channel sides when a sash is raised into vertical position.

In Fig. 2 the lower sash is shown swung to horizontal position and the brake plates are released and their brake shoes frictionally engaged with the runner channel sides so that the lower sash cannot be moved vertically. The structureand arrangement for the upper sash is the same as that for the lower sash so that the upper sash may be swung inwardly and locked against vertical movement when thus swung.

Provision must be made to securely lockthe sash against accidental swinging to open position after they have been raised into vertical or closed position. The main object of .*my invention is to produce improved latching mechanism for locking the sash against accidental swinging movement to open position. At the upper end of each runner frame a latch tongue or abutment 30 is yieldably supported and extends into the path of a latch plate 31 supported from the sash and having the latch opening 32, for receiving the latch tongue I have shown the latch tongue or abutment projected or deflected from the lower end'of a spring bar 33 which at its upper end is secured against the rear side of the web of the respective runner frame. The web has the longitudinal opening or slot 34: through which the latch tongue projects and in which slot the lower partof the spring bar maybe normally disposed as shown on the drawing.

The spring bar thus holds the detent orlatch tongue yieldably at the outside of the runner frame web with its beveled front face in the path of the latch plate so that when a sash is swung to closed position the latch tongues will be forced inwardly llllllll ing part of the latch mechanism secured onthe' sash. As shown in Figs. 3 and the latch plate 31 together with its notch engages against the respective inner edge of the sash, with the-inner end 31" of the plate extending through an'opening 36 in the sid wall 37' of the sash. This inner end of the H latch plate is at right angles with the onter 30 or latch tongue engaging part and the inner end is secured to thefr'ont wall 38 of the sash. As shown, this front wall. '38 is clamped between the latch plate end 31 and ,1 the escutcheon or rivets 40.

Intermediate its ends the latch plate is de plate-89 by means of screws flected to form the wall sections all and 4-2- at right angles, respectively, with the latch engaging end 31 and the inner end 31. m The unlocking key or cam structure" is of S-shape and its central section 43-is reciproc'able in a groove or passageway 34 formed between'the wall section 42 and the plate or strap 45 secured thereto; At its 45 outer end'the key section 43 extends through a passageway 46 extending through the wall 31 and the escut-cheon'plate 39, the outer section 47 forming a linger plate-whereby the key structure may be pushed inwardly to effect unlocking of the sash. The opening 46 in the escutcheon plate is" enlarged so that the finger plate may engage therein to be flush with the eseutcheon plate when the key member is pushed inwardly. At its outer end the key section 35 is deflected forwardly to form a cam end l8 which extends into the lock 32 of the lock plate 31 to be shiftable therein when the key v structure is manipulated. The cam end has the rounded or beveled rear surface 49 and in the normal or closed position of a sash the latch tongues therefore extend into the latch openings 32 between the rear wall v F openings and the cam ends 48 of the key structures, and the sash will then be securely locked against swinging movement. To release a sash for swinging movement pres sure is applied against the finger plat-es ll of the key structures whereupon their cam ends d8 willbe pressed with their rounded surfaces 49 against the beveled surfaces 30 of the latch tongues to force said latch tongues inwardly and out of the latch openhu s-82, the outer faces of the cam ends eventually being positioned in front of the latch tongue ends to hold said tongues in unlocking position. The sash can then be readily swung inwardly to open position as will be clear from reference to Fig. 4,the' outer faces of'the cam ends being flush with the outer faces of the latch plates 31.

When an open sash is swung to closed position the latch plate will first engage with the latch tongues to force them inwardly, but when the point of the latch tongues, which tongues are being constantly pushed outwardly by their supporting spring bars 33, are opposite the rounded approaching edges of the cam ends 48 of the key structure, the latch tongues will force themselves into the latch openings 32 and will shift the key structures forwardly until the latch tongues are again fully within the latch openings and in looking engagement with the latch plates, as shown in. Fig. 3. The sashes are thus automatically securely locked against swinging movement when they are swung into vertical closing position Having described my invention, I claim follows:-' I 1 1. In combination, a window frame,- a window sash hinged to the frame to swing to'either open or closed position, a latch plate member on said sash, a yieldable latch tongue projecting into the path of said latch plate-member when said sash is moved to closing position, cooperation of said latch plate member with said latch tongue causing first inward shift of said latch tongue andth'en release thereof into position in front of the latch plate member to thereby lock the sash in closedposition, a key member shiftable on said latch plate member in a direction at right angles to said sash, said latch tongue and key member having wedging surfaces adapted to eo-operate upon movement of said key member in inward direction to cause the latch tongue to be shifted away from the path of said latch plate member whereby to'permit opening. of said sash, said wedging surfaces co-operating whensaid sash is being closed to shift the keymember in outward direction to permit locking engagement of. said cam plate with said tongue.

2. In combination, a window frame, a sash frame hinged to the window frame to swing, alatch plate member on one of .said

frames having a latch opening, a yieldable latch bolt on the other frame tending to said key member forcing the cam end into 10 enter said latch opening to lock the sash engagement with said bolt to cause said bolt frame in closed position, a key member to be shifted out of the latch opening and shiftable on said latch plate member in a prevented from entering said opening by direction at right angles to the sash, said said cam end whereby to release said sash key member having a cam end projecting frame for swing to open position. 1 into said latch opening in front of the latch In witness whereof, I hereunto subscribe bolt when said sash frame is looked in closed my name this 15th day of February, 1.926. position by said bolt, inward pressure of CHARLES F. BOUGEK. 

